Valve



Dec. 3, 1929. B. BANNISTER 1,738,135

VALVE Filed Feb. 11,, 1925 2 sheets sheet 2 ,L. 9 20 I? I6 7-. |Q |l I FIG 2 '2 1 E,

1N VEN TOR.

7M ATTORNEYS Patented Dec. 3, 1929 UNITED STATES PATENT OFFICE BRYANT BANNISTEB, OF PITTSBURGH, PENNSYLVANIA VALVE Application filed February 11, 1925. Serial No. 8,389.

This invention relates to valves and more vious to those skilled in this particular art particularly to multi-port disc valves such are accomplished by means of this invention, as are adapted for use in high pressure steam one embodiment of which is shown for the lines and similar places. purposes of illustration in the accompanying An object of this invention is to provide drawing, in which Figure 1 is a transverse a valve of the type described wherein all section through the valve body on the line pressure parts can be forged, and of. such 11 of Fig. 2, showing the control mechadesign that the valve parts proper are free nism for opening and closing the valve. Fig. to expand in all directions without stressing 2 is a cross section on the line 2-2 of Fig. 1, 10 the valve body, so that the said parts can showing the valve disc in position to close be made of the most suitable material with the ports of the valve seats and Fig. 3 is out regard to their expansion characteristics. a similar View, showing the valve open.

A further object is to provide a valve of The particular embodiment of this inventhe type set forth, in which the pressure of tion which is illustrated in the drawings con- 19 the fluid traversing the valve or the fluid templates the provision of two housing mempressure in the pipe line with which the valve bers having aligned openings for the pasis associated is utilized to assist in pressing sage of fluid therethrough. A central spaca valve disc against the associated seat so as ing member which accommodates the valve to eliminate all chattering of the disc. Such operating rod is provided between the two 20 a construction also accomplishes an additionhousing members and the latter are bolted al object of this invention, namely, the pro thereto. Two circular plug-like members, vision of a valve which is especially suited each of which has a circular series of valve to throttling service, since the pressure of portsare clamped within the housing against the disc upon the associated seat protects the the central spacing member in such a posilatter from the erosive action of the fluid tion that the ports of each member are aligned which would otherwise occur. with the ports of the other. Two valve discs hen the requirements are such that a having a similar series of ports arerotatably valve of minimum size must be used there mounted between the two valve seats and is a consequent reduction in port area so that are adapted to be moved so as to open or in the ordinary construction of valves hereclose the ports of the valve seats. Each port tofore used there has been a sudden increase in each valve seat gradually increases in size in the velocity of the fluid traversing the from the face adjacent the valve discs to the valve as it approached the port or ports of outer face of the seat in order to provide a the valve seat and a sudden decrease in its gradual increase in velocity of the fluid fol- 35 velocity as it left the ports. This has relowed by a gradual decrease without abruptsulted in setting up eddy currents, and other ly affecting the rate of flow. The valve discs drawbacks, which greatly aflect the rate of are each pressed against the associated valve flow, and materially reduce the efliciency of seat and sufficient space is provided between the valve. A still further object of the inthe two discs to permit fluid pressure to enter vention is to provide a highly efficient valve therebetween and assist in pressing the discs of the type set forth so constructed as to against the assoclated seats. provide a gradual increase in the velocity of The lllustrated mechanism embodying the the fluid from the valve inlet to the ports of above structure consists of two housing memthe valve seat without causing any abrupt bers 5 and 6 having central inlet and outlet change in the rate of flow and to provide a openings 7 and 8, respectively, for the pasgradual decrease in the velocity of the fluid sage of fluid therethrough. A central spacfrom the valve ports to the outlet without ing member 9 1s interposed between the houscausing any abrupt variation in the rate of ing parts 5 and 6 and the latter are securely flow. bolted thereto. Two plug-like members,

These and other objects which will be obforming valve seats, 10 and 11 are clamped in spaced relation to each other between the housing members 5 and 6, respectively, and cooperating shoulders 12 on the central spacing member 9. Each valve seat is provided with a circular series of ports 13 and the valve seats are positioned so that the ports in one member are spaced from but aligned with the ports in the other member. Each port gradually increases in size from the inner face of each valve seat to the outer face, as clearly shownin Figs. 2 and 3, so

that even with valves of minimum size where small ports are necessary there will be'no sudden increase or decrease in the velocity of the fluid traversing the valve, but a gradual increase from the inlet opening 7 through the ports of the valve and then a gradual decrease in velocity to the outlet 8. The gradual increase in size of the ports from the inner faces of the valve seats to outer faces adjacent the inlet or outlet openings provides for this gradual change in velocity without abruptly affecting the rate of flow with the result that a valve of materially higher efficiency is provided.

Two separate valve discs 14 and 15 are rotatably mounted upon a pin 16 which is received in'aligned bores 17 formed in the inner faces of the valve seats. Each disc has aligned ports 18 which provide communicating passages between the ports of the two valve seats when the valve discs are in proper position. The latter are, of course, adapted to cut off communication between the ports of the valve seats when the valve is in closed position as shown in Figs. 1 and 2. The inner face of each disc: 14 and 15 has a counterbore- 19 which surrounds the supporting pin 16, and a sping 20 is positioned therein so as to press each disc against the associated valve seat. The discs are of such size that a space 21 is provided between them so that the pressure of the fluid passing through the valve and the pressure in the pipe line with which the valve is associated is adapted to enterthe space 21 and assist the spring in pressing the discs against their associated valve seats. The inner surface of each valve seat is cut back at 22 in order to reduce the bearing surface between the disc and the seat so as to render the former easily movable. The fluid pressure will pass around the pin 16 into the space 22 so as to more or less balance each valve disc but this pressure is obviously insuflicient to force the disc awayfrom its 7 seat, due to the difference in area of the two sides of the discs which are subject to the fluid pressure.

The mechanism for o aerating the valve includes" a lever 23 which is mounted upon a pin24-in a slot 25 formed in the adjacent faces of the two valve discs. The lever extends outwardly through a slot 26 formed on the edge of the spacer member 9 and extends into a transverse bore 27 where it is received within an opening 28 formed in an operating rod 29 mounted for reciprocation in the bore 27. The outer end of the operating rod is threaded to a nut 30 mounted for rotation in a supporting cap 31 and a hand wheel 32 is secured to the nut in order to rotate it. The operating rod 29 extends through a packing 33 which is provided at one end of the bore to prevent any leakage of fluid pressure from the valve at that point.

When the valve discs are in the position shown in Figs. 1 and 2 all communication between the ports of the valve seat 10 and those of the valve seat 11 is cut off. Operation of the rod 29 through the mechanism described rotates the valve discs until their ports coincide with the ports of the valve seats as shown in Fig. 3, when the valve is in fully opened position. Fluid pressure enters between the two valve discs and assists the spring 20 in firmly pressing each disc against its associated valve seat so as to protect the latter from the erosive action of fluid passing through the valve. The pressure of each valve disc part upon its associated seat also prevents chattering thereof. The spacing between the parts renders it possible to form them from the most suitable material without regard to their expansion characteristics, since the valve parts are free to expand in all directions without producing any undesirable stress in the valve body.

What I claim as new and desire to secure by Letters Patent is:

1. A disc valve having in combination a spacing member, separate ported valve seat members, inlet and outlet housings, means for clamping said housings to said spacing member so as to clamp said valve seat members in place and a valve disc rotatably positioned between said valve seat members for controlling the flow through the ports thereof.

2. A disc valve having in combination a housing provided with a fluid inlet, a housing having a fluid outlet, a ported valve seat member removably disposed within said inlet housing and provided with passages shaped so as to gradually increase the velocity of fluid traversing the valve from said inlet to the ports of said valve seat member, a second ported valve seat member removably disposed within said outlet housing and spaced from said first seat, said second valve seat being provided with passages shaped so as to gradually decraase the velocity of said fluid as it approaches said out-let and means adapted to open and close the ports of said members.

3. A disc valve having in combination inlet and outlet housings, a spacing member therebetween, spaced ported valve seat me1nbers in said housings, means for clamping said housings to said spacing member so as to clamp said valve seat members in place and two valve discs rotatably disposed between said valve seat members for controlling the flow through the ports thereof.

In testimony whereof, I have hereunto subscribed my name this 4th day of February,

BRYANT BANNISTER. 

